Formula: NaHCO3.H3BO3.2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.351, β = 1.459, γ = 1.486
Bireflectance/Birefringence δ: 0.135
2V angle: 48° (calculated), 50° (measured)
Dispersion: Medium, r < v
Optical orientation: α = b, β Ù a = 1° , z Ù c = 9°
Optical axial plane:
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